HDFS-16031. Possible Resource Leak in org.apache.hadoop.hdfs.server.aliasmap#InMemoryAliasMap (#3027)

(cherry picked from commit 3fdeb74)

Author: Nargeshdb

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/aliasmap/InMemoryAliasMap.java

@@ -320,21 +320,15 @@ static File createSnapshot(InMemoryAliasMap aliasMap) throws IOException {
   private static File getCompressedAliasMap(File aliasMapDir)
       throws IOException {
     File outCompressedFile = new File(aliasMapDir.getParent(), TAR_NAME);
-    BufferedOutputStream bOut = null;
-    GzipCompressorOutputStream gzOut = null;
-    TarArchiveOutputStream tOut = null;
-    try {
-      bOut = new BufferedOutputStream(
-          Files.newOutputStream(outCompressedFile.toPath()));
-      gzOut = new GzipCompressorOutputStream(bOut);
-      tOut = new TarArchiveOutputStream(gzOut);
+
+    try (BufferedOutputStream bOut = new BufferedOutputStream(
+            Files.newOutputStream(outCompressedFile.toPath()));
+         GzipCompressorOutputStream gzOut = new GzipCompressorOutputStream(bOut);
+         TarArchiveOutputStream tOut = new TarArchiveOutputStream(gzOut)){
+
       addFileToTarGzRecursively(tOut, aliasMapDir, "", new Configuration());
-    } finally {
-      if (tOut != null) {
-        tOut.finish();
-      }
-      IOUtils.cleanupWithLogger(null, tOut, gzOut, bOut);
     }
+
     return outCompressedFile;
   }